babel-preset-es2015 is still needed

Author: yyx990803

package.json

@@ -27,6 +27,7 @@
     "babel-core": "^6.11.4",
     "babel-eslint": "^6.1.2",
     "babel-loader": "^6.2.4",
+    "babel-preset-es2015": "^6.9.0",
     "babel-preset-es2015-loose": "^7.0.0",
     "babel-preset-flow-vue": "^1.0.0",
     "buble": "^0.12.3",